Excelore Pet Waste Dispenser with Bonus Travel Dog Bowl "Multi-mode Detection: The stud finder is used for finding and locating the center and edges of wood or metal studs up to 1 1/(2 ) in (38mm) deep, while AC live wire up to 2 in (51mm) deep. " "Graphical LCD Display: The multi function wall scanner detector has an illuminated graphical LCD screen, which indicates detection mode, signal strength, automatic calibration and battery indication.Please replace a brand new 9-volt battery when the Low Battery Indicator icon displays. " "Make Your Life Easy: This Classware stud finder will save your time and efforts, making the task completion EASIER. This multi-scanner can detect the edges and center of metal studs behind walls, floors and ceilings as well as the live AC wires. It is easy, fast and even fun to to find all of the wires and studs that are hidden behind the walls of your house without calling a professional electrician! Try it out and see for yourself! " "Smart Sound Warning: The wall detector offers BEEP SIGNAL ALERT reminding you of the stud's position/location. "